Door frame



FIG. 1 is a back view of a door frame showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a bottom view thereof; and,

FIG. 6 is a top view thereof. 

CLAIM The ornamental design for a door frame, as shown and described. 